diff --git a/README b/README
index a329ebe..b8b1d70 100644
--- a/README
+++ b/README
@@ -35,8 +35,9 @@ variables:
 * PLATFORM
 * HOSTNAME
 
-Sit detects currently the build platform using the HOSTNAME variable. If sit 
-cannot determine the PLATFORM it uses the default platform specified in sit.conf.
+Sit detects currently the build platform using the SITE_PLATFORM_AME variable.
+If sit cannot determine the PLATFORM it uses the default platform specified
+in sit.conf.
 For each platform configuration files are stored unter 
   $SIT_PATH/etc/platform-configs/$PLATFORM/*